diff options
| author | Martin Storsjo <martin@martin.st> | 2017-10-20 16:05:02 +0300 |
|---|---|---|
| committer | Martin Storsjo <martin@martin.st> | 2017-10-20 16:33:25 +0300 |
| commit | cf697df5ad1495f167181dec0976ee228bec6378 (patch) | |
| tree | 94f8601c2745b9d9355c8182769bd638a5f31f1e | |
| parent | c366b3db8fd78013edc5968df8507473b6fa71e6 (diff) | |
Avoid reading out of bounds due to negative aaIccIndexMapped
Fixes: 3452/clusterfuzz-testcase-4898065225875456
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
| -rw-r--r-- | libSBRdec/src/psdec.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/libSBRdec/src/psdec.cpp b/libSBRdec/src/psdec.cpp index 965917a..88a79a4 100644 --- a/libSBRdec/src/psdec.cpp +++ b/libSBRdec/src/psdec.cpp @@ -944,7 +944,7 @@ void initSlotBasedRotation( HANDLE_PS_DEC h_ps_d, /*!< pointer to the module sta FIXP_SGL invL; FIXP_DBL ScaleL, ScaleR; - FIXP_DBL Alpha, Beta; + FIXP_DBL Alpha, Beta, AlphasValue; FIXP_DBL h11r, h12r, h21r, h22r; const FIXP_DBL *PScaleFactors; @@ -1015,8 +1015,11 @@ void initSlotBasedRotation( HANDLE_PS_DEC h_ps_d, /*!< pointer to the module sta ScaleR = PScaleFactors[noIidSteps + h_ps_d->specificTo.mpeg.coef.aaIidIndexMapped[env][bin]]; ScaleL = PScaleFactors[noIidSteps - h_ps_d->specificTo.mpeg.coef.aaIidIndexMapped[env][bin]]; - Beta = fMult (fMult( Alphas[h_ps_d->specificTo.mpeg.coef.aaIccIndexMapped[env][bin]], ( ScaleR - ScaleL )), FIXP_SQRT05); - Alpha = Alphas[h_ps_d->specificTo.mpeg.coef.aaIccIndexMapped[env][bin]]>>1; + AlphasValue = 0; + if (h_ps_d->specificTo.mpeg.coef.aaIccIndexMapped[env][bin] >= 0) + AlphasValue = Alphas[h_ps_d->specificTo.mpeg.coef.aaIccIndexMapped[env][bin]]; + Beta = fMult (fMult( AlphasValue, ( ScaleR - ScaleL )), FIXP_SQRT05); + Alpha = AlphasValue>>1; /* Alpha and Beta are now both scaled by 2 shifts right */ |